单项选择题

It can be inferred from the passage that the author______.

A．is in favor of prohibiting passengers use of electronic devices completely
B．has overestimated the danger of electromagnetic interference
C．hash' t formed his own opinion on this problem
D．regards it as unreasonable to exercise a total ban during flight
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单项选择题
According to the passage, which of the following sentence is true
A．RTCA has ordered that all airlines ban portable electronic devices from being used during "critical" stages of flight.
B．Individual airlines have the right to decide whether or not to ban portable electronic devices during flight.
C．Almost all airlines enforce a total ban of portable electronic devices during flight.
D．Experts have recommended airlines to prohibit passengers from using electronic devices during take-off and landing.
单项选择题
According to the passage, which of the following sentences doesn't correctly describe most of backward languages
A．They consist largely of grunts and groans.
B．They are extremely complex, delicate, and ingenious pieces of machinery for the transfer of ideas.
C．They fall behind our Western languages in their vocabularies.
D．They don' t possess the machinery for vocabulary expansion.
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